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Diane Rwigara was Rwanda's only female presidential candidate until she was disqualified.

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Diane Rwigara was Rwandan President Paul Kagame's only female challenger

Rwigara has been an outspoken critic of Kagame

Lagos, Nigeria (CNN)Diane Rwigara, a leading critic of Rwandan President Paul Kagame, was arrested on charges of tax evasion and forgery.

Rwandan police also posted a message on Twitter saying Rwigara and members of her family were held on Sunday for not responding to summons and were later released.

"They are accused of tax evasion, and secondly Diane Rwigara is accused of using fake documents while she was gathering signatures for (her) presidential candidacy," Theos Badege, police spokesman, told reporters on Monday, according to local media reports.

"They have been brought to CID for questioning, after refusing to respond to three summons as stated by the law. After questioning at CID, Anne Rwigara, Diane Rwigara and Adeline Rwigara were escorted home by the police."

Her friends and family say Rwigara is being persecuted for holding different views and championing Rwandans' rights.

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Rwigara, 35, was the only female challenger in last month's elections, which Kagame won by a landslide 98.8%.

In an interview with CNN in the lead up to the elections, she said her candidacy had been targeted, first by the leak of nude photos that she said were fake.

Rwigara also was disqualified from standing in the elections by the country's electoral commission who accused her of submitting names of dead people and not gaining enough signatures from supporters. Rwigara vigorously denied the allegations.

A former military strongman praised for turning around the country's fortune, Kagame enjoys huge popularity in the country, which has seen strong economic growth in recent years and improved standards of living.

Critics argue the successes of Kagame's tenure have come at a high cost for civil society.

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Rwanda currently leads the world in terms of share of female legislators -- 61% of the country's parliament are women -- but female presidential candidates haven't been as successful.

In 2003, Alvera Mukabaramba made a bid for the presidency but later withdrew and joined forces with Kagame. She ran again in 2010 alongside another woman, Victoire Ingabire, a Netherlands-based Hutu lawyer who returned to Rwanda to stand in the elections.

Ingabire ran into trouble over comments she made about the country's 1994 genocide and was later sentenced to 15 years in prison for treason and "denying genocide."